{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["used for", "conjunction", "compare"], "input": "We investigate the problem of fine-grained sketch-based image retrieval -LRB- SBIR -RRB- , where free-hand human sketches are used as queries to perform instance-level retrieval of images ."}
{"used for": [{"subject": "free-hand human sketches", "object": "instance-level retrieval of images"}], "conjunction": [], "compare": []}